Nut-lock



(No Model.) A. P. R TSGHAU.

NUT LOCK.

No. 447,738. Patented Mar. 3,1891.

3? I, vwewtoz wi cmowo ,fi @G 9 fizz QM M3 Wm UNITED STATES ARTHUR F. PRITSOIIAU,

OF DENVER, COLORADO.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 447,738, dated March 3, 1891.

Application filed June '7, 1890.

To all whom it may concern.-

. Be it known that I, ARTHUR F. PRITSOHAU, of Denver, in the cou nty of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Nut-Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in automatic nut-locks, the object of the same being to provide a device of the above character which may be put on the bolt with but little effort.

A further object is to provide a nut-lock offering uniform and firm resistance to the strain on the fish-plate.

A further object is to provide a nut-lock which when relaxing will not cut into the nut, and one so constructed that its ends will not sink into the oval hole of the fish-plate.

A further object is to provide a nut-lock of the above character which will be simple and economical in construction and durable and efficient in use; and with these ends in view my invention consists in the certain features of construction and combinations of parts,

as will be hereinafter fully described, and

pointed out in the claim.

In the accompanying; drawings, Figure 1 shows the nut-lock in position. Figs. 2 and 3 are end views of the lock, .the former with shoulder and the latter without. Figs. at, 5, 6, and 7 are side views of modified forms, and Figs. 8 and 9 are perspective views of the preferred forms, Fig.8 showing the condition of the look before placed in position and Fig. 9 illustrating its position when on the bolt.

The lock is made of one piece of metal carefully tempered and of very strong tension.

The lock shown in Fig. 8 is made from a single piece of metal and is cut away on opposite sides thereof about one-fourth distance on each side of its center, starting with the Serial No. 354,569- (No model.)

other, as shown in Fig. 9. "When in position on the bolt, the point D touches on the flange of the rail, thereby preventing the look from touching.

In Fig. 2 the construction shows the look formed with the rectangular shoulder E and wedge-shaped ends. Fig. 3 shows the relative features of Fig. 2, with the shoulders omitted.

Fig. 4 is a side view of one of the looks with the wedge-shaped looks, with the ends F overlapping each other, before being placed on the bolt with the ends in a downward position.

In Fig. 5 the wedge-shaped lock is shown with the ends G having the upward curv In Fig. 6 the lock is wedgeshaped, with the ends II thereof curving within and past each other.

In Fig. '7 the wedge-shaped lock is shown with the end I having the downward curve and the end K curved upwardly and above the end I.

It will be observed that when, through wear and tear, slack is formed on the bolt. the spring uncoils with great force, crowding the one wedge-shaped end farther upon the other, thus taking up the slack, and although the lateral strain on the fish-plate is very great when a train passes, yet this will never cause the lock to give way by the wedge ends unsliding, as will occur in spring-locks acting directly against the fish-plate.

The tongs employed to coil the lock are so constructed thatthey will automatically hold the same on tension until the nut is tightened.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

A nut-lock consisting of a spring expanclined or tapered toward its ends and outer sides forming the wedge-shaped sections B, said ends being coiled and partially overlapped so as toembrace the bolt and in frictional contact at their inclined edges, and the central point of the ring being adapted to rest on the flange of the rail and form a fulcrum, substantially as described.

specification in the presence of two subscribing witnesses.

ARTHUR F. PRITSOIIAU. lVitnesses:

LAWRENCE MANSMANZ,

LEO J. MANGE.

sion-ring having its opposite inner sides in- 9 In testimony whereof I have signed this 

